[프로그래머스,SQL,group by] #7. 입양 시각 구하기

https://programmers.co.kr/learn/courses/30/lessons/59412

SELECT HOUR(DATETIME) as "HOUR" , count(*) as "COUNT"
from ANIMAL_OUTS
group by HOUR
having HOUR between 9 and 19
order by hour(DATETIME)